Title :
Boundary magnetic signal demodulation of electromagnetic tomography system
Author :
Ze, Liu ; Min, He ; Hanliang, Xiong ; Ling-An, Xu
Author_Institution :
Dept. of Autom. Control, Beijing Jiaotong Univ., China
fDate :
31 Aug.-4 Sept. 2004
Abstract :
This paper describes an orthogonal signal demodulation method used in electromagnetic tomography (EMT) system. The method, which uses two phase adjustable orthogonal vectors, can demodulate the boundary magnetic signals of EMT sensor effectively and rapidly. To generate the excitation signal and orthogonal vectors, direct digital synthesizers (DDS) are used. And a novel correlation feed back algorithm is designed to adjust the initial phases of two orthogonal vectors. The image reconstruction experiment demonstrates that the demodulation method is effective.
Keywords :
biomagnetism; computerised tomography; demodulation; direct digital synthesis; image reconstruction; medical image processing; EMT sensor; boundary magnetic signal demodulation; correlation feedback algorithm; direct digital synthesizer; electromagnetic tomography system; excitation signal; image reconstruction experiment; orthogonal signal demodulation method; orthogonal vector; Biomedical measurements; Demodulation; Geologic measurements; Image reconstruction; Magnetic field measurement; Magnetic flux; Magnetic materials; Magnetic sensors; Space technology; Tomography;
Conference_Titel :
Signal Processing, 2004. Proceedings. ICSP '04. 2004 7th International Conference on
Print_ISBN :
0-7803-8406-7
DOI :
10.1109/ICOSP.2004.1452696
